﻿/* Copyright 2010-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System.Collections.Generic;
using System.Linq;

namespace MongoDB.Driver.Linq.Linq3Implementation.Misc
{
    internal static class AsReadOnlyListExtensions
    {
        public static IReadOnlyList<T> AsReadOnlyList<T>(this IEnumerable<T> list)
        {
            return (list as IReadOnlyList<T>) ?? list.ToList().AsReadOnly();
        }

        public static IReadOnlyList<T> AsReadOnlyList<T>(this IReadOnlyList<T> list)
        {
            return list;
        }
    }
}
